﻿using SlamDunk.CMS.Model.DataModel;
using System;
using System.Collections.Generic;
using System.Configuration;
using System.Data;
using System.Data.SqlClient;
using System.Runtime.Remoting.Messaging;
using System.Text;
using SD.Common.PoweredByLee;

namespace SlamDunk.CMS.DAL
{
    public class UserDal
    {
        #region # 静态构造器

        /// <summary>
        /// SqlHelper
        /// </summary>
        private static readonly SqlHelper _SqlHelper;

        /// <summary>
        /// 静态构造器
        /// </summary>
        static UserDal()
        {
            _SqlHelper = new SqlHelper(ConfigurationManager.ConnectionStrings["CMS"].ConnectionString);
        }

        #endregion

        #region 01.根据用户名获取单个实体对象
        /// <summary>
        /// 根据用户名获取单个实体对象
        /// </summary>
        /// <param name="userName">用户名</param>
        /// <returns>单个实体对象</returns>
        public User GetModel(string userName)
        {
            string sql = "SELECT * FROM Users WHERE UserName = @UserName";
            using (SqlDataReader reader = _SqlHelper.ExecuteReader(sql, new SqlParameter("@UserName", userName)))
            {
                if (reader.Read())
                {
                    return this.ToModel(reader);
                }
                else
                {
                    return null;
                }
            }
        }
        #endregion

        #region 00.单例构造器
        /// <summary>
        /// 构造方法
        /// </summary>
        public UserDal() { }

        /// <summary>
        /// 创建对象静态方法
        /// </summary>
        /// <returns>UserDal实例</returns>
        public static UserDal CreateInstance()
        {
            UserDal userDal = CallContext.GetData(typeof(UserDal).Name) as UserDal;
            if (userDal == null)
            {
                userDal = new UserDal();
                CallContext.SetData(typeof(UserDal).Name, userDal);
            }
            return userDal;
        }
        #endregion

        #region 01.添加方法
        /// <summary>
        /// 添加一个实体对象
        /// </summary>
        /// <param name="user">要添加的实体对象</param>
        /// <returns>添加完毕后的实体对象</returns>
        public User Add(User user)
        {
            string sql = "INSERT INTO Users (UserName, Password, RealName, PhoneNumber, Email, DelFlag, AddTime)  output inserted.Id VALUES (@UserName, @Password, @RealName, @PhoneNumber, @Email, @DelFlag, @AddTime)";
            SqlParameter[] args = new SqlParameter[] {
                new SqlParameter("@UserName", ToDBValue(user.UserName)),
                new SqlParameter("@Password", ToDBValue(user.Password)),
                new SqlParameter("@RealName", ToDBValue(user.RealName)),
                new SqlParameter("@PhoneNumber", ToDBValue(user.PhoneNumber)),
                new SqlParameter("@Email", ToDBValue(user.Email)),
                new SqlParameter("@DelFlag", ToDBValue(user.DelFlag)),
                new SqlParameter("@AddTime", ToDBValue(user.AddTime)),
            };
            //根据newId返回新添加的实体对象
            int newId = (int)_SqlHelper.ExecuteScalar(sql, args);
            return this.GetModel(newId);
        }
        #endregion

        #region 02.删除方法（物理删除）
        /// <summary>
        /// 删除一个实体对象
        /// </summary>
        /// <param name="id">要删除的实体对象Id</param>
        /// <returns>受影响的行数</returns>
        public int PhysicalDelete(int id)
        {
            string sql = "DELETE FROM Users WHERE Id = @Id";
            SqlParameter arg = new SqlParameter("@Id", id);
            return _SqlHelper.ExecuteNonQuery(sql, arg);
        }
        #endregion

        #region 04.修改方法
        /// <summary>
        /// 修改一个实体对象
        /// </summary>
        /// <param name="user">构造好的要修改的实体对象</param>
        /// <returns>受影响的行数</returns>
        public int Update(User user)
        {
            StringBuilder sql = new StringBuilder();
            sql.Append("UPDATE Users SET UserName = @UserName");
            sql.Append(", Password = @Password");
            sql.Append(", RealName = @RealName");
            sql.Append(", PhoneNumber = @PhoneNumber");
            sql.Append(", Email = @Email");
            sql.Append(", DelFlag = @DelFlag");
            sql.Append(", AddTime = @AddTime");
            sql.Append(" WHERE Id = @Id");
            SqlParameter[] args = new SqlParameter[] {
                new SqlParameter("@Id", user.Id)
                ,new SqlParameter("@UserName", ToDBValue(user.UserName))
                ,new SqlParameter("@Password", ToDBValue(user.Password))
                ,new SqlParameter("@RealName", ToDBValue(user.RealName))
                ,new SqlParameter("@PhoneNumber", ToDBValue(user.PhoneNumber))
                ,new SqlParameter("@Email", ToDBValue(user.Email))
                ,new SqlParameter("@DelFlag", ToDBValue(user.DelFlag))
                ,new SqlParameter("@AddTime", ToDBValue(user.AddTime))
            };
            return _SqlHelper.ExecuteNonQuery(sql.ToString(), args);
        }
        #endregion

        #region 05.根据主键获取单个实体对象
        /// <summary>
        /// 根据主键获取单个实体对象
        /// </summary>
        /// <param name="id">主键</param>
        /// <returns>单个实体对象</returns>
        public User GetModel(int id)
        {
            string sql = "SELECT * FROM Users WHERE Id = @Id";
            using (SqlDataReader reader = _SqlHelper.ExecuteReader(sql, new SqlParameter("@Id", id)))
            {
                if (reader.Read())
                {
                    return ToModel(reader);
                }
                else
                {
                    return null;
                }
            }
        }
        #endregion

        #region 07.获取总记录条数
        /// <summary>
        /// 返回总记录条数
        /// </summary>
        /// <returns>总记录条数</returns>
        public int GetCount()
        {
            string sql = "SELECT COUNT(*) FROM Users WHERE DelFlag = 0";
            return (int)_SqlHelper.ExecuteScalar(sql);
        }
        #endregion

        #region 08.分页获取实体对象集合
        /// <summary>
        /// 分页获取实体对象集合
        /// </summary>
        /// <param name="start">起始行</param>
        /// <param name="end">终止行</param>
        /// <returns>实体集合</returns>
        public List<User> GetModelList(int start, int end)
        {
            List<User> list = new List<User>();
            string sql = "SELECT * FROM (SELECT *, ROW_NUMBER() OVER(ORDER BY Id) AS RowIndex FROM Users WHERE DelFlag = 0) AS t WHERE RowIndex >= @start AND RowIndex <= @end";
            using (SqlDataReader reader = _SqlHelper.ExecuteReader(sql, new SqlParameter("@start", start), new SqlParameter("@end", end)))
            {
                while (reader.Read())
                {
                    list.Add(ToModel(reader));
                }
            }
            return list;
        }
        #endregion

        #region 09.根据条件获取记录条数（1个参数）
        /// <summary>
        /// 根据条件获取记录条数（1个参数）
        /// </summary>
        /// <param name="field">字段名称</param>
        /// <param name="arg">条件参数</param>
        /// <returns>记录条数</returns>
        public int GetCount(string field, string arg)
        {
            string sql = string.Format("SELECT COUNT(*) FROM Users WHERE DelFlag = 0 AND {0} LIKE '%{1}%'", field, arg.FilterSql());
            return (int)_SqlHelper.ExecuteScalar(sql);
        }
        #endregion

        #region 10.根据条件获取记录条数（2个参数）
        /// <summary>
        /// 根据条件获取记录条数（2个参数）
        /// </summary>
        /// <param name="field1">字段名称</param>
        /// <param name="field2">字段名称</param>
        /// <param name="arg1">条件参数</param>
        /// <param name="arg2">条件参数</param>
        /// <returns>记录条数</returns>
        public int GetCount(string field1, string arg1, string filed2, string arg2)
        {
            string sql = string.Format("SELECT COUNT(*) FROM Users WHERE DelFlag = 0 AND {0} LIKE '%{1}%' AND {2} LIKE '%{3}%'", field1, arg1.FilterSql(), filed2, arg2.FilterSql());
            return (int)_SqlHelper.ExecuteScalar(sql);
        }
        #endregion

        #region 11.根据条件获取记录条数（3个参数）
        /// <summary>
        /// 根据条件获取记录条数（3个参数）
        /// </summary>
        /// <param name="field1">字段名称</param>
        /// <param name="field2">字段名称</param>
        /// <param name="field3">字段名称</param>
        /// <param name="arg1">条件参数</param>
        /// <param name="arg2">条件参数</param>
        /// <param name="arg3">条件参数</param>
        /// <returns>记录条数</returns>
        public int GetCount(string field1, string arg1, string field2, string arg2, string field3, string arg3)
        {
            string sql = string.Format("SELECT COUNT(*) FROM Users WHERE DelFlag = 0 AND {0} LIKE '%{1}%' AND {2} LIKE '%{3}%' AND {4} LIKE '%{5}%'", field1, arg1.FilterSql(), field2, arg2.FilterSql(), field3, arg3.FilterSql());
            return (int)_SqlHelper.ExecuteScalar(sql);
        }
        #endregion

        #region 12.根据条件获取记录条数（4个参数）
        /// <summary>
        /// 根据条件获取记录条数（4个参数）
        /// </summary>
        /// <param name="field1">字段名称</param>
        /// <param name="field2">字段名称</param>
        /// <param name="field3">字段名称</param>
        /// <param name="field4">字段名称</param>
        /// <param name="arg1">条件参数</param>
        /// <param name="arg2">条件参数</param>
        /// <param name="arg3">条件参数</param>
        /// <param name="arg4">条件参数</param>
        /// <returns>记录条数</returns>
        public int GetCount(string field1, string arg1, string field2, string arg2, string field3, string arg3, string field4, string arg4)
        {
            string sql = string.Format("SELECT COUNT(*) FROM Users WHERE DelFlag = 0 AND {0} LIKE '%{1}%' AND {2} LIKE '%{3}%' AND {4} LIKE '%{5}%' AND {6} LIKE '%{7}%'", field1, arg1.FilterSql(), field2, arg2.FilterSql(), field3, arg3.FilterSql(), field4, arg4.FilterSql());
            return (int)_SqlHelper.ExecuteScalar(sql);
        }
        #endregion

        #region 17.根据IDataReader对象返回实体对象方法
        /// <summary>
        /// 根据IDataReader对象返回实体对象方法
        /// </summary>
        /// <param name="reader">IDataReader对象</param>
        /// <returns>实体对象</returns>
        public User ToModel(IDataReader reader)
        {
            User user = new User();
            user.Id = (int)ToModelValue(reader as SqlDataReader, "Id");
            user.UserName = (string)ToModelValue(reader as SqlDataReader, "UserName");
            user.Password = (string)ToModelValue(reader as SqlDataReader, "Password");
            user.RealName = (string)ToModelValue(reader as SqlDataReader, "RealName");
            user.PhoneNumber = (string)ToModelValue(reader as SqlDataReader, "PhoneNumber");
            user.Email = (string)ToModelValue(reader as SqlDataReader, "Email");
            user.DelFlag = (bool)ToModelValue(reader as SqlDataReader, "DelFlag");
            user.AddTime = (DateTime)ToModelValue(reader as SqlDataReader, "AddTime");
            return user;
        }
        #endregion

        #region 18.C#值转数据库值空值处理
        /// <summary>
        /// C#值转数据库值空值处理
        /// </summary>
        /// <param name="value">C#值</param>
        /// <returns>处理后的数据库值</returns>
        public object ToDBValue(object value)
        {
            if (value == null)
            {
                return DBNull.Value;
            }
            else
            {
                return value;
            }
        }
        #endregion

        #region 19.数据库值转C#值空值处理
        /// <summary>
        /// 数据库值转C#值空值处理
        /// </summary>
        /// <param name="reader">IDataReader对象</param>
        /// <param name="columnName">列名</param>
        /// <returns>C#值</returns>
        public object ToModelValue(IDataReader reader, string columnName)
        {
            if (reader.IsDBNull(reader.GetOrdinal(columnName)))
            {
                return null;
            }
            else
            {
                return reader[columnName];
            }
        }
        #endregion
    }
}
